Three species of the genus Sarax are recognized in the Papuan region. Among them, two species, Sarax newbritainensis, new species, from New Britain, and S. monodenticulatus, new species, from Waigeo Island are described. Sarax newbritainensis resembles S. willeyi in having the same number of denticles on the pedipalpal tarsus, but they distinctly differ from each other in body size, form of carapace, length of legs and number and arrangement of the trichobothria of tibia of leg IV. Sarax monodenticulatus is distinguished from the other two Papuan species by possessing a single denticle on the pedipalpal tarsus. The taxonomic status and the natural history of the species are discussed.